208 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



and Acraeoid Heliconidae have been represented in color in Plates 

 5-8. Each large rectangle upon the left hand side of the Plate 

 represents a hind wing, the small middle rectangles show the colors 

 of the cell of the hind wing, and the right hand rectangles give the 

 fore wings, all being projected in the manner illustrated in Figs. 4 

 and b, Plate 1. The chief advantage in Keeler's projection method 

 lies in the fact, that similar areas in the projection of the wings lie 

 vertically imder or over one another, and thus by merely glancing 

 lip or down the plates one may observe the color- variations which 

 occur in homologous cells of all the species represented. 



III. General Discussion of the Color-Patterxs and of 



^llMICRY IN THE GeNEKA HeLICONIUS AND EuEIDES. 



Among the species of the genera Heliconiiis and Eueides we find 

 remarkably little variation in venation, but great diversity in color- 

 pattern of the wings, and in this respect they are very different from 

 the Danaoid Heliconidae, where, it will be remembered, we find fully 

 twenty different tyi^es of venation and only two types of color- 

 pattern . 



(1) 77ie Four Color Types in the Genus Heliconiiis. Schatz 

 and Kober ('85-92) divide the species of the genus Heliconius into 

 four groups based on color differences, as follows: — (1) the 

 "Antiochus group" (Plate 4, Fig. 50); (2) the "Erato group" 

 (Fig. 60); (3) the "Melpomene group" (Fig. 59); and (4) the 

 " Svlvaniis group," a good example of which is Heliconius eucrate 

 (Fig. 58, Plate 4). 



It will become apparent through an inspection of Figs. 50, 60, 59, 

 and 58, which represent respectively, Heliconius antiochus, H. erato, 

 H. melpomene, and H. eucrate, that the first three are quite closely 

 related in color-pattern, while the fourth (H. eucrate) approaches 

 very closely to the plan of coloration of the Melinaea type of the 

 Danaoid Heliconidae. In fact this resemblance is so close that it 

 may be safely said that the members of the " Sylvanus group," to 

 which H. eucrate belongs, mimic the Danaoid Hehconidae. 



The "Antiochus group" is represented by Heliconius anti- 

 ochus (Plate 4, Fig. 50, and Plate 5, Fig 62). H. sara, H. galanthus, 

 and H. charitonius" (Plate 5, Figs. 61, 63, 64) are also members of 

 this group ; other examples are H. apseudes, H. cydno, H. chiones, 

 H. hahnesi, H. sappho, H. leuce, H. eleusinus, and H. clysonymus. 



